共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
4.
5.
中国红的嘴巴,一头飘逸的头发,亮翅露出两道杠,号称“会飞的中队长”,两胁如祥云般的鳞状斑纹,且以“中华”命名,是国之象征。中华秋沙鸭,颜值与气质爆棚,是爱鸟界人士苦苦追寻的候鸟明星。 相似文献
6.
2020年3月15日,在抚顺市开展鸟类调查过程中,发现2只中华秋沙鸭,雄鸟、雌鸟各1只,为国家一级保护野生动物.发现地点位于抚顺望花区滨河路高阳橡胶坝西侧,其所处生境为浑河开阔水面,属永久性河流湿地.在查阅辽宁鸟类分布相关文献资料发现,中华秋沙鸭在辽宁抚顺属于分布新纪录. 相似文献
7.
黑龙江省中华秋沙鸭种群及其保护现状 总被引:2,自引:0,他引:2
中华秋沙鸭(Mergus squamatus)属雁形目鸭科鸟类,别名鳞协秋沙鸭、秋沙鸭;是第三纪冰川时期遗留的孑遗物种,因此被称作鸟类中的活化石。其分布区本来就很狭窄,种群数量也不大。近40年来,由于森林资源的大量开发,中华秋沙鸭的栖息和繁殖环境遭到严重破坏,使其分布区逐渐变小,由于人们的捕杀和误杀,致使其种群数量不断下降,目前呈弧角状分布,黑龙江省种群数量在170只左右,已被国际自然与自然资源保护联盟(IVCN)和国际鸟盟(Birdlife International)定为全球性濒危物种,列为《世界濒危鸟红皮书》,在中国已定为国家I级保… 相似文献
8.
9.
10.
11.
12.
传统的人参生产是依附于林业资源的产业,它是以占有使用林地资源为前提,因而,进行人参生产与林业资源的保护及强化生态建设产生了矛盾。林参矛盾由来已久,如何变林参相互制约为互相促进是需要各级政府及相关部门认真研究的重要课题。 相似文献
13.
14.
15.
Tapan Kumar Nath Mohammed Jashimuddin Md. Kamruzzaman Vaskar Mazumder Md. Kamrul Hasan Sukumar Das 《Journal of Sustainable Forestry》2013,32(8):562-577
ABSTRACTThe Chunati Wildlife Sanctuary (CWS), a degraded protected area in southeastern Bangladesh, had been under comanagement since 2004. This study examined phytosociological characteristics and diversity of trees in CWS and discussed villagers’ opinions on the impact of comanagement on forest conservation. Following a stratified and systematic sampling 140 circular plots, 17.84-m radius each, were laid out in seven forest beats for the assessment of phytosociological characteristics and tree diversity. Several key-informant interviews and 15 focus group discussions were held to explore the impact of comanagement on forest conservation and on villagers’ livelihood. A total of 93 tree species were identified having a diameter at breast height (dbh) of ≥ 5 cm in 36 plant families. The dominant species were Acacia auriculiformis, Dipterocarpus turbinatus, Ficus hispida, and Tectona grandis. The average density of trees was 239 trees/ha of which 60% was composed of planted exotic species. Nearly 90% trees were belonging to 5- to 15-cm dbh class and the Shannon-Wiener index was 3.15. The comanagement governance had brought positive changes in forest conservation. However, to sustain the engagement of poor villagers in the comanagement and conservation of degraded CWS, more collective efforts are needed to support their living. 相似文献
16.
In this paper, based on a long-term monitoring of water cycle in the water and soil conservation forest stands of Pinus tabulaeformis and Robinia pseudoacacia, the soil moisture deficit is calculated. Following the principles of runoff-collecting forestry and applying the forest
structure investigation results, the authors developed a formula to calculate appropriate density for forests on the basis
of different diameters at breast height (DBH). Using this method to manage forests, the natural water requirement of forests
can be met and soil drought can be avoided. In addition, with long-term monitoring of soil moisture in stands, the authors
also give an appropriate managing density specifically for the water and soil conservation forests of P. tabulaeformis and R. pseudoacacia in the loess area which is according to soil moisture content, or with the lowest soil moisture content and invalid moisture
frequency as the indexes.
__________
Translated from Science of Water and Soil Conservation, 2007, 5(2): 55–59 [译自: 中国水土保持科学] 相似文献
17.
18.
19.
生物多样性保护现状及发展趋势 总被引:1,自引:0,他引:1
生物多样性是人类赖以生存的生物资源,是经济得以持续发展的基础。工业革命以来的200多年,人类经济发展在数量和规模上取得了令人瞩目的成就,创造了前所未有的物质财富,但资源和能源的过度消耗,破坏了生态平衡和人类赖以生存发展的地球环境,致使生物多样性受到严重威胁。如何保护生物多样性、保护人类共有的家园已经成为当前国际国内共同关注的话题,各国都积极采取了保护生物多样性行动,并开展了一系列研究工作。 相似文献
20.
云杉落针病是白龙江、洮河水源涵养林区最为严重的林木叶部病害。为加强对该病的管理,有效控制其危害和在白龙江、洮河水源涵养林区乃至整个西北地区进一步扩散蔓延,参照有害生物危险性分析(Pest Risk Analysis)方法,结合该区森林资源状况和病虫害发生发展情况,对云杉落针病在白龙江、洮河水源涵养林区的潜在风险性进行了分析和评价。结果表明:云杉落针病为中度危险且接近高度危险性病害。并提出了相应的风险管理策略。 相似文献